User's Manual

8 310543
Service
AMV Disassembly
This procedure describes how to disassemble the
automatic metering valve. Refer to Parts information
on pages 13 and 14.
NOTE: The numbers in parentheses in the text refer to
reference numbers in the parts drawings and parts
lists.
NOTE: Needle Chuck Tool 918482 is available. Order
separately. See page 17.
To disassemble the AMV, perform the following proce-
dure:
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 6.
1. Flush the metering valve if possible. Relieve the
pressure.
2. Disconnect the air and fluid hoses. Remove the
metering valve from its mounting.
3. Remove the nozzle from the retainer (2). Clean
and inspect the nozzle.
4. Remove the stop screw (7).
5. Turn the nut (8) counterclockwise to unlock and
remove the retainer (2) and disassemble the
retainer as follows:
a. Remove the retaining ring (12) with a retaining
ring compression tool.
b. Place the retainer (2) on a flat surface with the
threaded end up and press the needle seal
(6c) with a 1/4 in. (6 mm) dowel to remove the
support washer (9), o-ring (15), and seal from
the cavity.
6. Install the needle chuck tool onto the needle (6b)
through the retainer end of the body (1).
7. Remove the air cap (3) from the valve body (1).
8. Remove the o-rings (19) from the groove in the air
cap (3).
9. Holding the needle chuck, remove the nylon nut
(11), washer (10), and packing (13).
10. Remove the air piston (4) from the body and
carefully remove the quad ring (20) by stretching it
from the groove in the piston. On AMV C02078
only, remove the second quad ring (21) from the
piston.
11. Remove the spring (23, not present on AMV
C02078) from the body (1).
12. Remove the needle (6b) from the valve body (1).
13. Stand the body (1) on the retainer end and press
the fluid piston (6a) from the body using a dowel.
Remove the o-rings (17, 16, and 14) and the
back-up ring (22) from the piston.